Quicktime won't play audio of .MOV files

Quicktime displays the video portion of .mov files from my digital camera, but the audio sounds like a (very loud) jackhammer, and seems to hang. Ditto with other viewers (irfanview, etc.) that depend on Quicktime.
However, Nero ShowTime plays the same files just fine.
It's as if quicktime didn't fully install codecs, although uninstall/reinstall sequence didn't help, and no messages indicating any problems.
PS... it used to work great (months ago) -- no clue how it was broken.
VPR-Matrix (Intel sysboard, P4 1.8GHz)   Windows XP  

I'm experiencing the same problem, with the only difference that my qt has no video on one account, and behaves normally in another account. I compared the versions, but the seem to be the same.

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